According to the Google Mobile Blog, Google is bringing additional features to Google Maps for Mobile for BlackBerry, bringing the effective revision number to 4.0. New in the version is support for voice search and Buzz. Voice search works by simply pressing and holding the green talk button. Additional features include:
-Use Labs to try experimental features like the Scale Bar or Terrain layer (great for hiking enthusiasts!).
-See nearby businesses at an address or location by selecting a point from the map.
-Report a problem with the map data or a business listing.
(via: Google Mobile Blog)